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JOHN -GULIeK BAKER, or PHILADELPHIA, PENNSYLVANIA, AssIeNeE To PIIMsELE.AND HENRY DIssTON, or SAME PLAGE.

Letters Patent No. 79,185, dated June 23, 1868.

IMPROVEMENT' IN SAWS.

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TO ALL WHOM. IT MAY OONCERN:

Beit known that I, JOHNGULICK BAKER, assigner to.1nyselt` and. HenryDisston, of Philadelphia, county of Philadelphia, State of Pennsylvania,have invented an Improvement in Adjustable Cutters or Teeth for Saws;and I do hereby declareV the `following to be a full, clear, and exactdescription of the same. f

My invention consists of the construction ofa detachable block adaptedto au opening'in the saw-blade, having` projections fit-tingcorresponding notches inthe tooth, and secured by a packing of lead orother soft metal, interposed between the block and the saw-plate, asfully described hereafter; the straining and warping ot the saw, whichresult from the use of ordinary rivets, being thusY avoided. i

In order to enable others skilled in the art tomake and apply myinvention, I willnow proceed to describe its construction and operation,reference being had to th'efaccompanying drawing, which forms a part ot'this specification, andin which Figure 1 represents part of the blade ofa circular saw prior to being prepared for the reception of theadjustable'and detachable cutters. A i

Figure 2, the saine, showing a slotfor the reception of a cutter, andone cutter inserted.

` Figure 3, a section on the line 1-2,`g. v

Figure 4, a section'on the line 3 4.

Figure 5, a section on the line 5-6; and

Figure 6, an edge view of the cutter, onthe line 7-8,iig. 2. l

Figs. 3, 4, 5,and 6 are drawn on an enlarged scale.

Similar letters refer to similar parts throughoutthe several views..

A represents part ofthe blade of a circular saw, onrthe edge of whichyare formed teeth or projections of the form, or approximating to theform, seen in'figrl, each 4tooth having the rounded back, a, and hollowfront, 6, v i l The teeth having been thus formed,`the next process,inthe presentinstance, is the preparation of the blade for thelreceptionof the detachable and adjustable cutters .,B, which is done by cutting'slots a, with par'- allel edges, in the blade, neach slot commencing atorjearthe junction lof the back, a, with the front, b, of a tooth, andtaking the inclined course represented.V j i l Y .i

On the rear edge of each slot is formed thev-shaped riby, best observedin the sectional views, gs. 3, 4,- und 5, the front edge, t, beingplain, but having a recess, m, the edges of which (and the bottom, ifdeemed necessary,) are V-shaped A i I 1 B is the detachable cutter, therear edge. of 'which is grooved, to suit the lshaped rear edge, y, oftheslot; and in the front edge of the cutter, towards the lower end of,4the same, is formed `a rack, n, linto any of the spaces between A theteeth of which can t projections, on a-,blocln e, adapted to .the recessm, which is deeper than the'block is thick.

The cutter having been pushed intoits place while the block c was.resting against the bottom of the recess m, the said block is pushedtowards the front edge of the cutter, so that some ofthe spaces betweenthe teeth of the latter shall be penetra-ted by the projections ou'theblock;V `and .the space between the latter and th bottom of the recessis now illedwith a packing, of lead or other soft metal, the sole dutyof which isto maintain the block in contactwith'the cutter. i Y A When,after'repeated sharpeniugs ofthe cutter byling or grindingithe -upperinclined end, g,=of the same, it becomes/necessary to readjust it Ibymoving it outwards, the sot`t-metal packing is first punched out orother-- wise removed, the block is then depressed into the recess m, sothat its projections'shall b e clear of those on the front edge of ythecutter, which is then pushed outwards to .the desired extent, afterwhich the block is readjusted to the rack ou the tooth, and soft-metalpacking introduced into' the recess m, between the bottom of the sameand the block.

- AIt will he seen that the block e, which holds the tooth in itspositionl fits nicelr in the/opening formed partly in the Ytooth andpartly in the blade, and is maintained in its place by the soft-metalpacking, but that neither the'block nor the packing bears 'with suchforce against the sides of the opening as to warp the saw- 'blade.Withoutvcolnfinng myself toany particulaform of tooth,

y I claim as my invention, and desire to secure Letters'Patent--A y Ahard-'metal block, adapted to an opening formed in the blade fof* saw,and having projections which fit notches in the dtachable tooth, .incombination with u Asoftemetal packingf`1tting 'the said opening at oneside of the block, and maintaining the latter in its place, all 4being co'nstru'ctedeand operating in' the manner suhlstantially as described.

Iii-testimony whereof, I have signedmy naine to this' lspecication inthe presence of two subscribing witnesses.

" JOHN GULICK BAKER.

Witnesses:

JOHN Wnma, W. J. R. .DELANY.

